/* ===================

AX2E (AXESCON XACML 2.0 Engine) is the Java authorization engine, which implements OASIS XACML 2.0 standard.
Copyright (C) 2007 AXESCON LLC

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA


Contact: AXESCON LLC - info{at}axescon.com

 =================== */
package axescon.xacml.engine.fn;

import axescon.xacml.api.*;
import axescon.xacml.model.shared.attr.AnyURIAttribute;
import axescon.xacml.model.shared.attr.StringAttribute;

import java.net.URISyntaxException;

/**
 * @author Date: Sep 28, 2005
 *         Responsibilities: implementes concatenation from axescon.xacml 2.0 spec,
 *         ch. A.3.9 String functions
 */
public class FnUrlStringConcatenate extends AbstractFn implements Fn {
    public int getArgTypeListLength() {
        return 2;
    }

    public int getMaxArgListLength() {
        return -1;
    }

    public Liquid exec(Liquid[] args) throws FunctionEvalIndeterminateException{

        String ret = ((AnyURIAttribute) args[0].getSingularUnsafe()).getValue().toString();
        for (int i = 1; i < args.length; i++) {
            ret += ((StringAttribute) args[i].getSingularUnsafe()).getValue();
        }

        try {
            return new Liquid(new AnyURIAttribute(ret));
        } catch (URISyntaxException e) {
            throw new FunctionEvalIndeterminateException("concatenated string is not URI",
                    XacmlException.ERR_CODE_PROCESSING_FN_WRONG_ARG_TYPE).setFnUrn(getFnUrn());
        }
    }

    public void setDataTypes(Class[] dataTypes) throws XacmlException {
        throw new XacmlException(getClass().getName() +" doesn't take any args"+XacmlException.ERR_CODE_CONFIG_FN_WRONG_ARG_LIST);
    }
          
    {
        dataTypes =new Class[]{AnyURIAttribute.class,StringAttribute.class};
    }


}
